There may be a lot of users out that might like to evaluate OpenEMS for their purposes. Right now every release comes with the source on Git. Have you considered delivering pre-built artifacts as part of the build/release process?
This would make it easier for others (like me) who are not professional software developers to consume the product (i.e. building a docker container with the artifact). This could help to grow the user base which could then help to make OpenEMS even more successful.